package StreamAPI;

import Lambda.dao.Employee;
import org.junit.Test;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Stream;

/**
 * 一、Stream 的三个操作步骤
 * 1.创建流
 * 2.中间操作
 * 3.终止操作
 */
public class TestStreamApi1 {
    //创建stream
    @Test
    public void test() {
        //1.   可以通过Collection系列集合提供的stream()h或parallelStream()
        List<String> list = new ArrayList<>();
        Stream<String> stream = list.stream();
        //2.通过Arrays中的静态方法stream()获取数组流
        Employee[] emps = new Employee[10];
        Stream<Employee> stream1 = Arrays.stream(emps);
        //3.通过Stream类中的静态方法of()
        Stream<String> stream2 = Stream.of("AA", "BB", "CC");
        //4.创建无限流
        //迭代
        Stream<Double> stream3 = Stream.iterate(0.5, (x) -> x * 2);
        stream3.limit(10).forEach(System.out::println);
        //生成
        Stream<Double> stream4 = Stream.generate(Math::random).limit(2);
        stream4.forEach(System.out::println);
    }
}
